262 VERTEBRATE ANIMALS. 
fore and hind limbs, are situated within the carapace (fig. 140, 
sand #), so that the shoulder-blade is placed zzszde the ribs 
instead of outside, as is usually the case. 
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Fig. 140.—Skeleton of a Tortoise (Emmys E uropea), seen from below, the plastron 
having been removed. ca Carapace, showing the flattened and expanded ribs: 
s Scapular arch, carrying the fore-limbs, and placed in the interior of the cara- 
pace ; # Pelvic arch, carrying the hind-limbs ; ~ Ribs. 
The Chelonia are conveniently divided into groups, according 
as the limbs are adapted for swimming (natatory), or for pro- 
gression on land (terrestrial); or, again, enable the animal to 
lead an amphibious life, sometimes on land and sometimes in 
the water, Of the strictly aquatic forms the best known are 
the edible Green Turtle (Chelone mydas) and the Hawk’s-bill 
Turtle (Chelone imbricata), The former is found abundantly ° 
in many of the seas of warm climates, and is largely imported 
into Europe as a delicacy. The latter (fig. 141) is truly a 
native of warm seas, though an occasional straggler has reached 
